EP1902088B1 - Decomposing system for polyisocyanate residues, and start-up method for the same - Google Patents
Decomposing system for polyisocyanate residues, and start-up method for the same Download PDFInfo
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- EP1902088B1 EP1902088B1 EP20060781221 EP06781221A EP1902088B1 EP 1902088 B1 EP1902088 B1 EP 1902088B1 EP 20060781221 EP20060781221 EP 20060781221 EP 06781221 A EP06781221 A EP 06781221A EP 1902088 B1 EP1902088 B1 EP 1902088B1
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- feed pipe
- decomposing
- water
- residual
- solvent
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- 239000005056 polyisocyanate Substances 0.000 title claims abstract description 104
- 229920001228 polyisocyanate Polymers 0.000 title claims abstract description 104
- 238000000034 method Methods 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 143
- 239000002904 solvent Substances 0.000 claims abstract description 88
- 229920000768 polyamine Polymers 0.000 claims abstract description 16
- 238000011144 upstream manufacturing Methods 0.000 claims description 12
- 239000003960 organic solvent Substances 0.000 abstract description 25
- 238000006243 chemical reaction Methods 0.000 abstract description 11
- 230000003301 hydrolyzing effect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000013067 intermediate product Substances 0.000 description 7
- 239000011343 solid material Substances 0.000 description 7
- NNOZGCICXAYKLW-UHFFFAOYSA-N 1,2-bis(2-isocyanatopropan-2-yl)benzene Chemical compound O=C=NC(C)(C)C1=CC=CC=C1C(C)(C)N=C=O NNOZGCICXAYKLW-UHFFFAOYSA-N 0.000 description 4
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 4
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 4
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 description 4
- 239000012948 isocyanate Substances 0.000 description 4
- 150000002513 isocyanates Chemical class 0.000 description 4
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 4
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 4
- -1 urea compound Chemical class 0.000 description 4
- 239000004202 carbamide Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- QXRRAZIZHCWBQY-UHFFFAOYSA-N 1,1-bis(isocyanatomethyl)cyclohexane Chemical compound O=C=NCC1(CN=C=O)CCCCC1 QXRRAZIZHCWBQY-UHFFFAOYSA-N 0.000 description 2
- OCJBOOLMMGQPQU-UHFFFAOYSA-N 1,4-dichlorobenzene Chemical compound ClC1=CC=C(Cl)C=C1 OCJBOOLMMGQPQU-UHFFFAOYSA-N 0.000 description 2
- ZDKYYMRLZONTFK-UHFFFAOYSA-N 3,4-bis(isocyanatomethyl)bicyclo[2.2.1]heptane Chemical compound C1CC2(CN=C=O)C(CN=C=O)CC1C2 ZDKYYMRLZONTFK-UHFFFAOYSA-N 0.000 description 2
- RNLHGQLZWXBQNY-UHFFFAOYSA-N 3-(aminomethyl)-3,5,5-trimethylcyclohexan-1-amine Chemical compound CC1(C)CC(N)CC(C)(CN)C1 RNLHGQLZWXBQNY-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000005058 Isophorone diisocyanate Substances 0.000 description 2
- GKXVJHDEWHKBFH-UHFFFAOYSA-N [2-(aminomethyl)phenyl]methanamine Chemical compound NCC1=CC=CC=C1CN GKXVJHDEWHKBFH-UHFFFAOYSA-N 0.000 description 2
- 239000007810 chemical reaction solvent Substances 0.000 description 2
- MVPPADPHJFYWMZ-UHFFFAOYSA-N chlorobenzene Chemical compound ClC1=CC=CC=C1 MVPPADPHJFYWMZ-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229940117389 dichlorobenzene Drugs 0.000 description 2
- KORSJDCBLAPZEQ-UHFFFAOYSA-N dicyclohexylmethane-4,4'-diisocyanate Chemical compound C1CC(N=C=O)CCC1CC1CCC(N=C=O)CC1 KORSJDCBLAPZEQ-UHFFFAOYSA-N 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- VOZKAJLKRJDJLL-UHFFFAOYSA-N tolylenediamine group Chemical group CC1=C(C=C(C=C1)N)N VOZKAJLKRJDJLL-UHFFFAOYSA-N 0.000 description 2
- DZIHTWJGPDVSGE-UHFFFAOYSA-N 4-[(4-aminocyclohexyl)methyl]cyclohexan-1-amine Chemical compound C1CC(N)CCC1CC1CCC(N)CC1 DZIHTWJGPDVSGE-UHFFFAOYSA-N 0.000 description 1
- YGYAWVDWMABLBF-UHFFFAOYSA-N Phosgene Chemical compound ClC(Cl)=O YGYAWVDWMABLBF-UHFFFAOYSA-N 0.000 description 1
- XZAHJRZBUWYCBM-UHFFFAOYSA-N [1-(aminomethyl)cyclohexyl]methanamine Chemical compound NCC1(CN)CCCCC1 XZAHJRZBUWYCBM-UHFFFAOYSA-N 0.000 description 1
- RPYFJVIASOJLJS-UHFFFAOYSA-N [3-(aminomethyl)-2-bicyclo[2.2.1]heptanyl]methanamine Chemical compound C1CC2C(CN)C(CN)C1C2 RPYFJVIASOJLJS-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 150000001718 carbodiimides Chemical class 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000539 dimer Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical compound OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000013638 trimer Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/02—Feed or outlet devices therefor
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
- C08J11/14—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with steam or water
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S422/00—Chemical apparatus and process disinfecting, deodorizing, preserving, or sterilizing
- Y10S422/901—Polymer dissolver
Definitions
- the present invention relates to a decomposing system for decomposing polyisocyanate residues to polyamine using high temperature and high pressure water, and a start-up method for the same.
- Polyisocyanate used as a raw material of polyurethane, is industrially produced, for example, by allowing polyamine to react with carbonyl chloride, for isocyanate reaction.
- Patent Document 1 also describes that the high temperature and high pressure water may be made to flow into the residual feed line before the residues are introduced in the reactor vessel.
- the present invention provides a start-up method for a decomposing system for decomposing polyisocyanate residues to polyamine using high temperature and high pressure water
- the decomposing system comprising a decomposing tank for allowing polyisocyanate residues and high temperature and high pressure water to contact with each other, a water feed pipe, connected to the decomposing tank, for feeding the high temperature and high pressure water to the decomposing tank, and a residual feed pipe, connected to the water feed pipe, for feeding the polyisocyanate residues to the decomposing tank together with the high temperature and high pressure water, wherein a solvent is previously filled in a connecting portion of the residual feed pipe with the water feed pipe, first, and then, the high temperature and high pressure water is fed from the water feed pipe to the decomposing tank, then, the solvent being fed from the residual feed pipe to the water feed pipe, first, and then, the polyisocyanate residues being fed thereto.
- the solvent is first fed from the residual feed pipe to the water feed pipe via which the high temperature and high pressure water is fed to the decomposing tank. Then, a supply flow from the residual feed pipe to the water feed pipe is formed. Due to this, when the polyisocyanate residues are subsequently fed from the residual feed pipe, the polyisocyanate residues are smoothly fed to the water feed pipe at a sufficient linear velocity, going along the supply flow thereof. Thus, the polyisocyanate residues are fully mixed with the high temperature and high pressure water at the confluence portion and then fed to the decomposing tank, without stay at the confluence portion. This can prevent a blockage caused by the production of solid materials growing out of an intermediate product produced by the reaction of the polyisocyanate residues and the high temperature and high pressure water, and can allow smooth start-up of the operation.
- the decomposing system comprises opening and closing unit (preferably flash opening and closing unit) interposed in the residual feed pipe at an end thereof connecting with the water feed pipe, and residual transporting unit interposed in the residual feed pipe at a location thereof on the upstream side of the opening and closing unit, that part of the residual feed pipe extending at least between the opening and closing unit and the residual transporting unit serves as the connecting portion in which the solvent is filled, that the connecting portion is increased in its inner pressure by transporting the solvent or the polyisocyanate residues to the connecting portion by the residual transporting unit in the state of the opening and closing unit being closed, and that the high temperature and high pressure water is fed from the water feed pipe to the decomposing tank, and after a decomposing temperature and a decomposing pressure of the decomposing tank reach a predetermined decomposing temperature and a predetermined decomposing pressure, the opening and closing unit is opened to feed the solvent from the residual feed pipe to a confluence portion thereof with the water feed pipe, first, and then, the polyisocyanate residue
- the present invention provides a decomposing system for polyisocyanate residues comprising a decomposing tank for allowing polyisocyanate residues and high temperature and high pressure water to contact with each other, a water feed pipe, connected to the decomposing tank, for feeding the high temperature and high pressure water to the decomposing tank, a residual feed pipe, connected to the water feed pipe, for feeding the polyisocyanate residues to the decomposing tank together with the high temperature and high pressure water, and solvent filling unit, interposed in the residual feed pipe at a portion thereof connecting with the water feed pipe, for filling the solvent in it.
- the solvent upon the start-up of the operation, the solvent is previously filled in the connecting portion of the residual feed pipe with the water feed pipe by the solvent filling unit. Then, the high temperature and high pressure water is fed from the water feed pipe to the decomposing tank. Thereafter, the solvent is fed from the residual feed pipe to the water feed pipe, first, and then, the polyisocyanate residues are fed thereto.
- the solvent upon start-up of the operation, the solvent is fed from the residual feed pipe to the water feed pipe via which the high temperature and high pressure water is fed to the decomposing tank. Then, a supply flow from the residual feed pipe to the water feed pipe is formed.
- the polyisocyanate residues are smoothly fed to the water feed pipe at a sufficient linear velocity, going along the supply flow thereof.
- the polyisocyanate residues are fully mixed with the high temperature and high pressure water at the confluence portion and then fed to the decomposing tank, without stay at the confluence portion. This can prevent a blockage caused by the production of solid materials growing out of an intermediate product produced by the reaction of the polyisocyanate residues and the high temperature and high pressure water, and can allow smooth start-up of the operation.
- this system further comprises opening and closing unit (preferably flash opening and closing unit), interposed in the residual feed pipe at an end thereof connecting with the water feed pipe, and residual transporting unit provided in the residual feed pipe at a location thereof on the upstream side of the opening and closing unit, and that part of the residual feed pipe extending at least between the opening and closing unit and the residual transporting unit serves as the above-mentioned connecting portion in which the solvent is filled.
- opening and closing unit preferably flash opening and closing unit
- the solvent is filled in the part between the residual transporting unit and the opening and closing unit, for a further stable start-up of the operation.
- the solvent or the polyisocyanate residues are transported by the residual transporting unit in the state of the opening and closing unit being closed, whereby the inner pressure of the connecting portion is increased.
- the high temperature and high pressure water is fed from the water feed pipe to the decomposing tank, and after a decomposing temperature and a decomposing pressure of the decomposing tank reach a predetermined decomposing temperature and a predetermined decomposing pressure, the opening and closing unit is opened to feed the solvent from the residual feed pipe to a confluence portion thereof with the water feed pipe, first, and then, the polyisocyanate residues are fed thereto.
- This can further effectively prevent a blockage caused by the production of solid materials growing out of an intermediate product produced by the reaction of the polyisocyanate residues and the high temperature and high pressure water, and can allow smooth start-up of the operation.
- FIG. 1 is a schematic block diagram showing an embodiment of a decomposing system for polyisocyanate residues of the present invention.
- a decomposing system 1 is equipped in the producing plant for polyisocyanate, for the purpose of decomposing polyisocyanate residues (distillation residues) to polyamine using high temperature and high pressure water, in the subsequent process of a producing process of producing polyisocyanate and a refining process of extracting polyisocyanate from the crude polyisocyanate (unrefined polyisocyanate) produced in the producing process by distillation operation and the like to separate polyisocyanate from residues (hereinafter referred to as polyisocyanate residues).
- the decomposing system 1 includes a hydrolyzer 2 served as a decomposing tank, a water feed pipe 3 connected to the hydrolyzer 2, a residual feed pipe 4 connected to the water feed pipe 3, a solvent feed line 5a serving as solvent filling unit for filling organic solvent in a solvent filling portion 6 mentioned later, and a solvent drain line 5b.
- the hydrolyzer 2 is a reactor for polyisocyanate residues to be hydrolyzed to polyamine by contact of the polyisocyanate residues with high temperature and high pressure water. It comprises a heat-resistant and pressure-resistant vessel whose temperature and pressure can be controlled.
- the water feed pipe 3 is a water feed line for feeding high temperature and high pressure water to the hydrolyzer 2. It comprises a heat-resistant and pressure-resistant pipe whose downstream end is connected to the hydrolyzer 2 and whose upstream end is connected to a water feed line for feeding water (recovered process water or ion-exchange water) not shown.
- a water pressure-feed pump 7 for pressure-transporting the high temperature and high pressure water toward the hydrolyzer 2 is interposed in the water feed pipe 3.
- a water heater 8 is interposed in the water feed pipe 3 at a location on the downstream side of the water pressure-feed pump 7.
- the residual feed pipe 4 is a residual feed line for feeding the polyisocyanate residues to the hydrolyzer 2 together with the high temperature and high pressure water. It comprises a heat-resistant and pressure-resistant pipe whose downstream end is connected to the water feed pipe 3 at a location on the downstream side of the water heater 8 and whose upstream end is connected to a residual polyisocyanate drum 9.
- the polyisocyanate residues separated in the refining process from the crude polyisocyanate which includes high-molecular-weight polyisocyanate produced in the polyisocyanate producing process is temporality held in the residual polyisocyanate drum 9.
- the polyisocyanate residues which are content of tar containing primarily high-molecular-weight polyisocyanates produced secondarily in the production process, include dimer, trimer, multimeric-polyisocyanate and so on which comprises carbodiimide, uretodion, isocyanurate and uretoneimine.
- Polyisocyanates that depend on polyisocyanate produced by a producing plant include, for example, polymethylenepolyphenylene polyisocyanate (MDI), tolylene diisocyanate (TDI), xylylenedi isocyanate (XDI), tetramethylxylylene diisocyanate (TMXDI), bis(isocyanatomethyl) norbornane (NBDI), 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate (IPDI), 4,4'-methylenebis(cyclohexylisocyanate) (H 12 MDI), bis(isocyanatomethyl) cyclohexane (H 6 XDI), and hexamethylene diisocyanate (HDI).
- MDI polymethylenepolyphenylene polyisocyanate
- TDI tolylene diisocyanate
- XDI xylylenedi isocyanate
- TMXDI
- the polyisocyanate residues can be previously adjusted in viscosity by allowing a part of polyisocyanate to coexist with it or by using an organic solvent (e.g. monochlorobenzene and dichlorobenzene) used as a reaction solvent in the production process of polyisocyanate.
- an organic solvent e.g. monochlorobenzene and dichlorobenzene
- a multistage diaphragm pump is used as the residual pressure-feed pump 10.
- a residual heater 11 is interposed in the residual feed pump 4 at a location on the downstream of the residual pressure-feed pump 10.
- a flash opening and closing valve 12 serving as opening and closing unit (flash opening and closing unit), is interposed in the residual feed pipe 4 at a location thereof on the downstream side of the residual pressure-feed pump 10 and at an end thereof to connect with the water feed pipe 3.
- the solvent feed line 5a and the solvent drain line 5b are provided with a solvent feed pipe 13 and a solvent drain pipe 14, respectively.
- a downstream end of the solvent feed pipe 13 of the solvent feed line 5a is connected to the residual feed pipe 4 at a location between the residual pressure-feed pump 10 and the residual drum 9.
- An upstream end of the solvent feed pipe 13 is connected to a solvent tank or a solvent circulation line, not shown.
- the organic solvent e.g. monochlorobenzene and dichlorobenzene used as the reaction solvent in the producing process of polyisocyanate is held or circulated in the solvent tank or the solvent circulation line.
- a solvent feed valve 15 for feeding or stopping feeding the organic solvent from the solvent feed pipe 13 to the residual feed pipe 4 is interposed in the solvent feed pipe 13.
- the solvent feed pipe 13 of the solvent feed line 5a may be connected to a delivery side (on the downstream side) of the residual pressure-feed pump 10, but it is preferable that the solvent feed pipe 13 is connected to a suction side (on the upstream side) of the same to facilitate pressure rise upon start up of the operation.
- a solvent drum not shown to previously hold the solvent in it for the start-up of the operation.
- An upstream end of the solvent drain pipe 14 of the solvent drain line 5b is connected to the residual feed pipe 14 at a location between the residual heater 11 and the flash opening and closing valve 12 and in the vicinity of the upstream side of the flash opening and closing valve 12. A downstream end of the same is connected to the solvent tank or the solvent circulation line mentioned above.
- a solvent drain valve 16 for draining or stopping draining the organic solvent from the residual feed pipe 4 to the solvent drain pipe 14 is interposed in the solvent drain pipe 14.
- part of the residual feed pipe 4 extending at least between the residual pressure-feed pump 10 and the flash opening and closing valve 12 disposed between the solvent feed pipe 13 and the solvent drain pipe 14 serves as the solvent filling portion 6 of the residual feed pipe 4 connected to the water feed pipe 3, for filling the organic solvent via the solvent feed/draining lines 5.
- the decomposing process is performed in continuous operation during which the solvent feed valve 15 and the solvent drain valve 16 are both closed, without the organic solvent being filled in the solvent filling portion 6 of the solvent drain pipe 14, while on the other hand, the flash opening and closing valve 12 is kept open.
- the polyisocyanate residues temporarily held in the residual drum 9 is pressure-transported through the residual feed pipe 4 by the residual pressure-feed pump 10, flowing toward the water feed pipe 3 via the flash opening and closing valve 12. Further, the polyisocyanate residues are heated to e.g. 120-180°C by the residual heater 11.
- the polyisocyanate residues are increased in pressure to a supply pressure of e.g. 5-30MPa by the residual pressure-feed pump 10 as well as in temperature to a supply temperature of 120-180°C, thereafter being flown into the water feed pipe 3.
- the water flowing in the water feed pipe 3 from the water feed line is pressure-transported through the water feed pipe 3 by the water pressure-feed pump 7, flowing toward the hydrolyzer 2, during which the water is heated to e.g. 190-300°C by the water heater 8.
- the water is increased in pressure to 5-30MPa as well as in temperature to 190-300°C, thereby to become a high temperature and high pressure water.
- the high temperature and high pressure water thus produced is flown into the hydrolyzer 2 together with the polyisocyanate residues coming from the residual feed pipe 4.
- the hydrolyzer 2 is controlled so that an inner temperature (the decomposing temperature) can be set at e.g. 190-300°C and an inner pressure (the decomposing pressure) can be set at e.g. 5-30MPa. Further, a hydrolytic ratio (a weight ratio of (high temperature and high pressure water / polyisocyanate residues)) is controlled to e.g. 0.5-5 under control of the residual pressure-feed pump 10 and the water pressure-feed pump 7.
- the polyisocyanate residues are hydrolyzed by the high temperature and high pressure water to produce corresponding polyamine as a decomposition product, while carbon dioxide, water, etc. are produced secondarily
- Polyamines include, for example, polymethylenepolyphenylene polyamine (MDA) corresponding to polymethylenepolyphenylene polyisocyanate (MDI), tolylene diamine (TDA) corresponding to tolylene diisocyanate (TDI), xylylene diamine (XDA) corresponding to xylylenedi isocyanate (XDI), tetramethylxylylene diamine (TMXDA) corresponding to tetramethylxylylene diisocyanate (TMXDI), bis(aminomethyl) norbornane (NBDA) corresponding to bis(isocyanatomethyl) norbornane (NBDI), 3-aminomethyl-3,5,5-trimethylcyclohexyl amine (IPDA) corresponding to 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate (IPDI), 4,4'-methylenebis(cyclohexylamine) (H 12 MDA) corresponding to 4,4
- the decomposition products drained from the hydrolyzer 2 is reduced in pressure to the atmospheric pressure, the decomposition products are separated to each in a dehydrating column not shown, and polyamine is collected.
- the polyamine thus collected is reused as polyamine of raw material in the producing process for polyisocyanate.
- the continuous operation is brought to a halt, for example, before and during a maintenance, and after the maintenance, the continuous operation re-starts.
- the organic solvent is previously filled in the solvent filling portion 6 as the start-up operation upon start up of the continuous operation. Then, after the high temperature and high pressure water is fed from the water feed pipe 3 to the hydrolyzer 2, the organic solvent is fed from the residual feed pipe 4 to the water feed pipe 3, first, and then, the polyisocyanate residues are fed thereto.
- the decomposing system 1 Before the start-up operation starts, the decomposing system 1 is at a shutdown.
- the flash opening and closing valve 12, the solvent feed valve 15, and the solvent drain valve 16 are closed, and the water pressure-feed pump 7, the residual pressure-feed pump 10, the water heater 8, and the residual heater 11 are at a standstill.
- the hydrolyzer 2 is not controlled in the inner temperature and pressure before the start-up, so that it is lower in the inner temperature and pressure before the start-up operation than under the continuous operation.
- the solvent feed valve 15 and the solvent drain valve 16 are first opened to allow the organic solvent to flow into the solvent filling portion 6 of the residual feed pipe 4 from the solvent feed pipe 13.
- the polyisocyanate residues staying in the solvent filling portion 6 is washed into the solvent drain pipe 14 by the organic solvent flowing into the solvent filling portion 6, so that the organic solvent is filled therein.
- the solvent feed valve 15 and the solvent drain valve 16 are both closed.
- the water pressure-feed pump 7 and the water heater 8 are brought into operation and the hydrolyzer 2 is controlled, to allow the high temperature and high pressure water to flow into the hydrolyzer 2 from the water feed pipe 3 until the predetermined decomposing temperature and pressure for the continuous operation mentioned above.
- the residual pressure-feed pump 10 and the residual heater 11 are brought into operation to pressure-transport the organic solvent and the polyisocyanate residues on the suction side (upstream side) of the residual feed pump 9 toward the organic solvent filled in the solvent filling portion 6, so as to increase the inner temperature and pressure of the solvent filling portion 6.
- the flash valve 12 is opened at the point of time the inner temperature and pressure of the solvent filling portion 6 exceed the predetermined feed temperature and feed pressure for the continuous operation mentioned above.
- the organic solvent is first fed with at least the predetermined feed temperature and pressure for the continuous operation from the residual feed pipe 4 to the water feed pipe 3, via which the high temperature and high pressure water is fed to the hydrolyzer 2, with the predetermined feed temperature and pressure for the continuous operation.
- a supply flow from the residual feed pipe 4 to the water feed pipe 3 is formed by the organic solvent fed.
- a rate of the supply flow is, for example, 0.3-3M/SEC.
- the polyisocyanate residues are smoothly fed from the residual feed pipe 4 to the water feed pipe 3 with the same power as that of the organic solvent, going along the supply flow of the organic solvent. Then, the polyisocyanate residues flowing into the water feed pipe 3 are fully mixed with the high temperature and high pressure water and then fed to the hydrolyzer 2, without stay at the confluence portion with the water feed pipe 3. This can allow the polyisocyanate residues and the high temperature and high pressure water to be mixed with each other at a sufficient linear velocity before flowing into the hydrolyzer 2.
- an intermediate product such as a urea compound
- the decomposing system for polyisocyanate residues and the start-up method for the same of the present invention are suitably used for producing polyisocyanate industrially.
Abstract
Description
- The present invention relates to a decomposing system for decomposing polyisocyanate residues to polyamine using high temperature and high pressure water, and a start-up method for the same.
- Polyisocyanate, used as a raw material of polyurethane, is industrially produced, for example, by allowing polyamine to react with carbonyl chloride, for isocyanate reaction.
- In this producing plant of polyisocyanate, after completion of the isocyanate reaction, high-molecular-weight polyisocyanate, which is a byproduct produced during the production, is separated from the crude polyisocyanate obtained.
- In recent years, it has been proposed that the residues secondarily produced are continuously fed to a reactor vessel in its liquid state, while also high temperature and high pressure water is continuously fed to the reactor vessel, with temperature of the reactor vessel controlled to 190-300°C, whereby the residues are decomposed to polyamine so that the polyamine obtained can be reused (cf.
Patent Document 1 cited below, for example). - [Patent Document 1] Japanese Unexamined Patent Publication No.
- However, in the method described by
Patent Document 1 cited above, the high temperature and high pressure water is continuously fed to the reactor vessel through another line separate from a residual feed line, so that the residues and the high temperature and high pressure water are first brought into contact with and mixed with each other in the reactor vessel. - However, this conventional method has the disadvantage that when getting contact with each other in the reactor vessel, the residues and the high temperature and high pressure water cannot be mixed with each other promptly and thoroughly, due to their substantial differences in their own nature.
-
Patent Document 1 cited above also describes that the high temperature and high pressure water may be made to flow into the residual feed line before the residues are introduced in the reactor vessel. - However, in the case that the high temperature and high pressure water is made to flow into the residual feed line, neither a linear velocity of the feed line nor a temperature rise of the residues is sufficient at a confluence portion upon start-up of an operation, due to which the residues and the high temperature and high pressure water are put in prolonged contact with each other before introduced in the reactor vessel. As a result, many intermediate products, including an urea compound and so on, are produced by the reaction of the residues and the high temperature and high pressure water and solid materials growing out of an urea compound and so on are produced, causing a possible blockage of the feed line.
- It is an object of the present invention to provide a decomposing system for polyisocyanate residues that is capable of suppressing reaction of polyisocyanate residues with high temperature and high pressure water to allow smooth start up of decomposition of the polyisocyanate residues. It is another object of the present invention to provide a start up method for the decomposing system for the polyisocyanate residues.
- The present invention provides a start-up method for a decomposing system for decomposing polyisocyanate residues to polyamine using high temperature and high pressure water, the decomposing system comprising a decomposing tank for allowing polyisocyanate residues and high temperature and high pressure water to contact with each other, a water feed pipe, connected to the decomposing tank, for feeding the high temperature and high pressure water to the decomposing tank, and a residual feed pipe, connected to the water feed pipe, for feeding the polyisocyanate residues to the decomposing tank together with the high temperature and high pressure water, wherein a solvent is previously filled in a connecting portion of the residual feed pipe with the water feed pipe, first, and then, the high temperature and high pressure water is fed from the water feed pipe to the decomposing tank, then, the solvent being fed from the residual feed pipe to the water feed pipe, first, and then, the polyisocyanate residues being fed thereto.
- According to the start-up method for the decomposing system for the polyisocyanate residues of the present invention, upon the start-up of the operation, the solvent is first fed from the residual feed pipe to the water feed pipe via which the high temperature and high pressure water is fed to the decomposing tank. Then, a supply flow from the residual feed pipe to the water feed pipe is formed. Due to this, when the polyisocyanate residues are subsequently fed from the residual feed pipe, the polyisocyanate residues are smoothly fed to the water feed pipe at a sufficient linear velocity, going along the supply flow thereof. Thus, the polyisocyanate residues are fully mixed with the high temperature and high pressure water at the confluence portion and then fed to the decomposing tank, without stay at the confluence portion. This can prevent a blockage caused by the production of solid materials growing out of an intermediate product produced by the reaction of the polyisocyanate residues and the high temperature and high pressure water, and can allow smooth start-up of the operation.
- Further, in this method, it is preferable that the decomposing system comprises opening and closing unit (preferably flash opening and closing unit) interposed in the residual feed pipe at an end thereof connecting with the water feed pipe, and residual transporting unit interposed in the residual feed pipe at a location thereof on the upstream side of the opening and closing unit, that part of the residual feed pipe extending at least between the opening and closing unit and the residual transporting unit serves as the connecting portion in which the solvent is filled, that the connecting portion is increased in its inner pressure by transporting the solvent or the polyisocyanate residues to the connecting portion by the residual transporting unit in the state of the opening and closing unit being closed, and that the high temperature and high pressure water is fed from the water feed pipe to the decomposing tank, and after a decomposing temperature and a decomposing pressure of the decomposing tank reach a predetermined decomposing temperature and a predetermined decomposing pressure, the opening and closing unit is opened to feed the solvent from the residual feed pipe to a confluence portion thereof with the water feed pipe, first, and then, the polyisocyanate residues are fed thereto.
- By feeding the polyisocyanate residues in this manner, a blockage caused by the production of solid materials growing out of an intermediate product produced by the reaction of the polyisocyanate residues and the high temperature and high pressure water can be prevented more effectively, thus allowing smooth start-up of the operation.
- The present invention provides a decomposing system for polyisocyanate residues comprising a decomposing tank for allowing polyisocyanate residues and high temperature and high pressure water to contact with each other, a water feed pipe, connected to the decomposing tank, for feeding the high temperature and high pressure water to the decomposing tank, a residual feed pipe, connected to the water feed pipe, for feeding the polyisocyanate residues to the decomposing tank together with the high temperature and high pressure water, and solvent filling unit, interposed in the residual feed pipe at a portion thereof connecting with the water feed pipe, for filling the solvent in it.
- According to the decomposing system for the polyisocyanate residues of the present invention, upon the start-up of the operation, the solvent is previously filled in the connecting portion of the residual feed pipe with the water feed pipe by the solvent filling unit. Then, the high temperature and high pressure water is fed from the water feed pipe to the decomposing tank. Thereafter, the solvent is fed from the residual feed pipe to the water feed pipe, first, and then, the polyisocyanate residues are fed thereto. This means that upon start-up of the operation, the solvent is fed from the residual feed pipe to the water feed pipe via which the high temperature and high pressure water is fed to the decomposing tank. Then, a supply flow from the residual feed pipe to the water feed pipe is formed. Due to this, when the polyisocyanate residues are subsequently fed from the residual feed pipe, the polyisocyanate residues are smoothly fed to the water feed pipe at a sufficient linear velocity, going along the supply flow thereof. Thus, the polyisocyanate residues are fully mixed with the high temperature and high pressure water at the confluence portion and then fed to the decomposing tank, without stay at the confluence portion. This can prevent a blockage caused by the production of solid materials growing out of an intermediate product produced by the reaction of the polyisocyanate residues and the high temperature and high pressure water, and can allow smooth start-up of the operation.
- It is preferable that this system further comprises opening and closing unit (preferably flash opening and closing unit), interposed in the residual feed pipe at an end thereof connecting with the water feed pipe, and residual transporting unit provided in the residual feed pipe at a location thereof on the upstream side of the opening and closing unit, and that part of the residual feed pipe extending at least between the opening and closing unit and the residual transporting unit serves as the above-mentioned connecting portion in which the solvent is filled.
- It is preferable that the solvent is filled in the part between the residual transporting unit and the opening and closing unit, for a further stable start-up of the operation.
- According to this system, the solvent or the polyisocyanate residues are transported by the residual transporting unit in the state of the opening and closing unit being closed, whereby the inner pressure of the connecting portion is increased. The high temperature and high pressure water is fed from the water feed pipe to the decomposing tank, and after a decomposing temperature and a decomposing pressure of the decomposing tank reach a predetermined decomposing temperature and a predetermined decomposing pressure, the opening and closing unit is opened to feed the solvent from the residual feed pipe to a confluence portion thereof with the water feed pipe, first, and then, the polyisocyanate residues are fed thereto. This can further effectively prevent a blockage caused by the production of solid materials growing out of an intermediate product produced by the reaction of the polyisocyanate residues and the high temperature and high pressure water, and can allow smooth start-up of the operation.
- When a start-up method for a decomposing system for polyisocyanate residues of the present invention is adopted in the decomposing system for polyisocyanate residues of the present invention, a blockage caused by production of solid materials growing out of an intermediate product produced by reaction of the polyisocyanate residues and high temperature and high pressure water can be prevented to allow smooth start-up of the operation.
-
-
FIG. 1 is a schematic block diagram showing an embodiment of a decomposing system for polyisocyanate residues of the present invention. -
- 1:
- Decomposing system
- 2:
- Hydrolyzer
- 3:
- Water feed pipe
- 4:
- Residual feed pipe
- 5a:
- Solvent feed line
- 5b:
- Solvent drain line
- 6:
- Solvent filling portion
- 10:
- Residual pressure-feed pump
- 12:
- Flash opening and closing valve
-
FIG. 1 is a schematic block diagram showing an embodiment of a decomposing system for polyisocyanate residues of the present invention. - In
FIG. 1 , adecomposing system 1 is equipped in the producing plant for polyisocyanate, for the purpose of decomposing polyisocyanate residues (distillation residues) to polyamine using high temperature and high pressure water, in the subsequent process of a producing process of producing polyisocyanate and a refining process of extracting polyisocyanate from the crude polyisocyanate (unrefined polyisocyanate) produced in the producing process by distillation operation and the like to separate polyisocyanate from residues (hereinafter referred to as polyisocyanate residues). The decomposingsystem 1 includes ahydrolyzer 2 served as a decomposing tank, awater feed pipe 3 connected to thehydrolyzer 2, aresidual feed pipe 4 connected to thewater feed pipe 3, asolvent feed line 5a serving as solvent filling unit for filling organic solvent in asolvent filling portion 6 mentioned later, and asolvent drain line 5b. - The
hydrolyzer 2 is a reactor for polyisocyanate residues to be hydrolyzed to polyamine by contact of the polyisocyanate residues with high temperature and high pressure water. It comprises a heat-resistant and pressure-resistant vessel whose temperature and pressure can be controlled. - The
water feed pipe 3 is a water feed line for feeding high temperature and high pressure water to thehydrolyzer 2. It comprises a heat-resistant and pressure-resistant pipe whose downstream end is connected to thehydrolyzer 2 and whose upstream end is connected to a water feed line for feeding water (recovered process water or ion-exchange water) not shown. - A water pressure-feed pump 7 for pressure-transporting the high temperature and high pressure water toward the
hydrolyzer 2 is interposed in thewater feed pipe 3. Awater heater 8 is interposed in thewater feed pipe 3 at a location on the downstream side of the water pressure-feed pump 7. - The
residual feed pipe 4 is a residual feed line for feeding the polyisocyanate residues to thehydrolyzer 2 together with the high temperature and high pressure water. It comprises a heat-resistant and pressure-resistant pipe whose downstream end is connected to thewater feed pipe 3 at a location on the downstream side of thewater heater 8 and whose upstream end is connected to aresidual polyisocyanate drum 9. - The polyisocyanate residues separated in the refining process from the crude polyisocyanate which includes high-molecular-weight polyisocyanate produced in the polyisocyanate producing process is temporality held in the
residual polyisocyanate drum 9. - The polyisocyanate residues, which are content of tar containing primarily high-molecular-weight polyisocyanates produced secondarily in the production process, include dimer, trimer, multimeric-polyisocyanate and so on which comprises carbodiimide, uretodion, isocyanurate and uretoneimine.
- Polyisocyanates that depend on polyisocyanate produced by a producing plant include, for example, polymethylenepolyphenylene polyisocyanate (MDI), tolylene diisocyanate (TDI), xylylenedi isocyanate (XDI), tetramethylxylylene diisocyanate (TMXDI), bis(isocyanatomethyl) norbornane (NBDI), 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate (IPDI), 4,4'-methylenebis(cyclohexylisocyanate) (H12MDI), bis(isocyanatomethyl) cyclohexane (H6XDI), and hexamethylene diisocyanate (HDI).
- In order to secure fluidity of the polyisocyanate residues, the polyisocyanate residues can be previously adjusted in viscosity by allowing a part of polyisocyanate to coexist with it or by using an organic solvent (e.g. monochlorobenzene and dichlorobenzene) used as a reaction solvent in the production process of polyisocyanate.
- A residual pressure-
feed pump 10, serving as residual transporting unit for pressure-transporting the polyisocyanate residues toward thewater feed pipe 3, is interposed in theresidual feed pipe 4. For example, a multistage diaphragm pump is used as the residual pressure-feed pump 10. Aresidual heater 11 is interposed in theresidual feed pump 4 at a location on the downstream of the residual pressure-feed pump 10. - Also, a flash opening and closing
valve 12, serving as opening and closing unit (flash opening and closing unit), is interposed in theresidual feed pipe 4 at a location thereof on the downstream side of the residual pressure-feed pump 10 and at an end thereof to connect with thewater feed pipe 3. - The
solvent feed line 5a and thesolvent drain line 5b are provided with asolvent feed pipe 13 and asolvent drain pipe 14, respectively. - A downstream end of the
solvent feed pipe 13 of thesolvent feed line 5a is connected to theresidual feed pipe 4 at a location between the residual pressure-feed pump 10 and theresidual drum 9. An upstream end of thesolvent feed pipe 13 is connected to a solvent tank or a solvent circulation line, not shown. The organic solvent (e.g. monochlorobenzene and dichlorobenzene) used as the reaction solvent in the producing process of polyisocyanate is held or circulated in the solvent tank or the solvent circulation line. - A
solvent feed valve 15 for feeding or stopping feeding the organic solvent from thesolvent feed pipe 13 to theresidual feed pipe 4 is interposed in thesolvent feed pipe 13. - The
solvent feed pipe 13 of thesolvent feed line 5a may be connected to a delivery side (on the downstream side) of the residual pressure-feed pump 10, but it is preferable that thesolvent feed pipe 13 is connected to a suction side (on the upstream side) of the same to facilitate pressure rise upon start up of the operation. When the time for a stable start-up is required, there may be separately provided a solvent drum (not shown) to previously hold the solvent in it for the start-up of the operation. - An upstream end of the
solvent drain pipe 14 of thesolvent drain line 5b is connected to theresidual feed pipe 14 at a location between theresidual heater 11 and the flash opening and closingvalve 12 and in the vicinity of the upstream side of the flash opening and closingvalve 12. A downstream end of the same is connected to the solvent tank or the solvent circulation line mentioned above. - A
solvent drain valve 16 for draining or stopping draining the organic solvent from theresidual feed pipe 4 to thesolvent drain pipe 14 is interposed in thesolvent drain pipe 14. - In this
discomposing system 1, part of theresidual feed pipe 4 extending at least between the residual pressure-feed pump 10 and the flash opening and closingvalve 12 disposed between thesolvent feed pipe 13 and thesolvent drain pipe 14 serves as thesolvent filling portion 6 of theresidual feed pipe 4 connected to thewater feed pipe 3, for filling the organic solvent via the solvent feed/draining lines 5. - Next, the decomposing process of decomposing polyisocyanate residues to polyamine by high temperature and high pressure water using the decomposing system is described below.
- The decomposing process is performed in continuous operation during which the
solvent feed valve 15 and thesolvent drain valve 16 are both closed, without the organic solvent being filled in thesolvent filling portion 6 of thesolvent drain pipe 14, while on the other hand, the flash opening and closingvalve 12 is kept open. - The polyisocyanate residues temporarily held in the
residual drum 9 is pressure-transported through theresidual feed pipe 4 by the residual pressure-feed pump 10, flowing toward thewater feed pipe 3 via the flash opening and closingvalve 12. Further, the polyisocyanate residues are heated to e.g. 120-180°C by theresidual heater 11. The polyisocyanate residues are increased in pressure to a supply pressure of e.g. 5-30MPa by the residual pressure-feed pump 10 as well as in temperature to a supply temperature of 120-180°C, thereafter being flown into thewater feed pipe 3. - On the other hand, the water flowing in the
water feed pipe 3 from the water feed line is pressure-transported through thewater feed pipe 3 by the water pressure-feed pump 7, flowing toward thehydrolyzer 2, during which the water is heated to e.g. 190-300°C by thewater heater 8. As a result, the water is increased in pressure to 5-30MPa as well as in temperature to 190-300°C, thereby to become a high temperature and high pressure water. Then, the high temperature and high pressure water thus produced is flown into thehydrolyzer 2 together with the polyisocyanate residues coming from theresidual feed pipe 4. - The
hydrolyzer 2 is controlled so that an inner temperature (the decomposing temperature) can be set at e.g. 190-300°C and an inner pressure (the decomposing pressure) can be set at e.g. 5-30MPa. Further, a hydrolytic ratio (a weight ratio of (high temperature and high pressure water / polyisocyanate residues)) is controlled to e.g. 0.5-5 under control of the residual pressure-feed pump 10 and the water pressure-feed pump 7. - As a result of this, in the
hydrolyzer 2, the polyisocyanate residues are hydrolyzed by the high temperature and high pressure water to produce corresponding polyamine as a decomposition product, while carbon dioxide, water, etc. are produced secondarily - Polyamines include, for example, polymethylenepolyphenylene polyamine (MDA) corresponding to polymethylenepolyphenylene polyisocyanate (MDI), tolylene diamine (TDA) corresponding to tolylene diisocyanate (TDI), xylylene diamine (XDA) corresponding to xylylenedi isocyanate (XDI), tetramethylxylylene diamine (TMXDA) corresponding to tetramethylxylylene diisocyanate (TMXDI), bis(aminomethyl) norbornane (NBDA) corresponding to bis(isocyanatomethyl) norbornane (NBDI), 3-aminomethyl-3,5,5-trimethylcyclohexyl amine (IPDA) corresponding to 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate (IPDI), 4,4'-methylenebis(cyclohexylamine) (H12MDA) corresponding to 4,4'-methylenebis(cyclohexylisocyanate) (H12MDI), bis(aminomethyl) cyclohexane (H6XDA) corresponding to bis(isocyanatomethyl) cyclohexane (H6XDI), and hexamethylene diamine (HDA) corresponding to hexamethylene diisocyanate (HDI).
- Then, after the decomposition products drained from the
hydrolyzer 2 is reduced in pressure to the atmospheric pressure, the decomposition products are separated to each in a dehydrating column not shown, and polyamine is collected. The polyamine thus collected is reused as polyamine of raw material in the producing process for polyisocyanate. - Although such decomposing process is performed in continuous operation as mentioned above, the continuous operation is brought to a halt, for example, before and during a maintenance, and after the maintenance, the continuous operation re-starts. In the decomposing
system 1, the organic solvent is previously filled in thesolvent filling portion 6 as the start-up operation upon start up of the continuous operation. Then, after the high temperature and high pressure water is fed from thewater feed pipe 3 to thehydrolyzer 2, the organic solvent is fed from theresidual feed pipe 4 to thewater feed pipe 3, first, and then, the polyisocyanate residues are fed thereto. - Next, such a start-up operation is described in detail. Before the start-up operation starts, the decomposing
system 1 is at a shutdown. The flash opening and closingvalve 12, thesolvent feed valve 15, and thesolvent drain valve 16 are closed, and the water pressure-feed pump 7, the residual pressure-feed pump 10, thewater heater 8, and theresidual heater 11 are at a standstill. Further, thehydrolyzer 2 is not controlled in the inner temperature and pressure before the start-up, so that it is lower in the inner temperature and pressure before the start-up operation than under the continuous operation. - Upon starting the start-up operation, the
solvent feed valve 15 and thesolvent drain valve 16 are first opened to allow the organic solvent to flow into thesolvent filling portion 6 of theresidual feed pipe 4 from thesolvent feed pipe 13. At the same time, the polyisocyanate residues staying in thesolvent filling portion 6 is washed into thesolvent drain pipe 14 by the organic solvent flowing into thesolvent filling portion 6, so that the organic solvent is filled therein. After completion of the filling of the organic solvent in thesolvent filling portion 6, thesolvent feed valve 15 and thesolvent drain valve 16 are both closed. - Separately from the above mentioned operation, the water pressure-feed pump 7 and the
water heater 8 are brought into operation and thehydrolyzer 2 is controlled, to allow the high temperature and high pressure water to flow into thehydrolyzer 2 from thewater feed pipe 3 until the predetermined decomposing temperature and pressure for the continuous operation mentioned above. - Thereafter, the residual pressure-
feed pump 10 and theresidual heater 11 are brought into operation to pressure-transport the organic solvent and the polyisocyanate residues on the suction side (upstream side) of theresidual feed pump 9 toward the organic solvent filled in thesolvent filling portion 6, so as to increase the inner temperature and pressure of thesolvent filling portion 6. Then, theflash valve 12 is opened at the point of time the inner temperature and pressure of thesolvent filling portion 6 exceed the predetermined feed temperature and feed pressure for the continuous operation mentioned above. - Then, the organic solvent is first fed with at least the predetermined feed temperature and pressure for the continuous operation from the
residual feed pipe 4 to thewater feed pipe 3, via which the high temperature and high pressure water is fed to thehydrolyzer 2, with the predetermined feed temperature and pressure for the continuous operation. When the organic solvent is fed from theresidual feed pipe 4 to thewater feed pipe 3, a supply flow from theresidual feed pipe 4 to thewater feed pipe 3 is formed by the organic solvent fed. A rate of the supply flow is, for example, 0.3-3M/SEC. Then, when the organic solvent filled in thesolvent filling portion 6 and the organic solvent on the suction side (upstream side) of the residual pressure-feed pump 9 are all fed to thewater feed pipe 3, the polyisocyanate residues are smoothly fed from theresidual feed pipe 4 to thewater feed pipe 3 with the same power as that of the organic solvent, going along the supply flow of the organic solvent. Then, the polyisocyanate residues flowing into thewater feed pipe 3 are fully mixed with the high temperature and high pressure water and then fed to thehydrolyzer 2, without stay at the confluence portion with thewater feed pipe 3. This can allow the polyisocyanate residues and the high temperature and high pressure water to be mixed with each other at a sufficient linear velocity before flowing into thehydrolyzer 2. This can prevent a blockage of thewater feed pipe 3 which is caused by the production of solid materials growing out of an intermediate product, such as a urea compound, produced by the reaction of the polyisocyanate residues and the high temperature and high pressure water. As a result of this, smooth start up of the decomposing operation can be accomplished. - While the illustrative embodiments of the present invention are provided in the above description, such is for illustrative purpose only and it is not to be construed restrictively. Modification and variation of the present invention that will be obvious to those skilled in the art is to be covered by the following claims.
- The decomposing system for polyisocyanate residues and the start-up method for the same of the present invention are suitably used for producing polyisocyanate industrially.
Claims (6)
- A start-up method for a decomposing system for decomposing polyisocyanate residues to polyamine using high temperature and high pressure water, the decomposing system comprising a decomposing tank for allowing the polyisocyanate residues and the high temperature and high pressure water to contact with each other, a water feed pipe connected to the decomposing tank for feeding the high temperature and high pressure water to the decomposing tank, and a residual feed pipe connected to the water feed pipe for feeding the polyisocyanate residues to the decomposing tank together with the high temperature and high pressure water,
wherein a solvent is previously filled in a connecting portion of the residual feed pipe with the water feed pipe,
then, the high temperature and high pressure water is fed from the water feed pipe to the decomposing tank,
then, the solvent is fed from the residual feed pipe to the water feed pipe, first, and then, the polyisocyanate residues are fed thereto. - The start-up method for the decomposing system according to Claim 1, wherein the decomposing system comprises opening and closing unit interposed in the residual feed pipe at an end thereof connecting with the water feed pipe, and residual transporting unit interposed in the residual feed pipe at a location thereof on an upstream side of the opening and closing unit,
wherein part of the residual feed pipe extending at least between the opening and closing unit and the residual transporting unit serves as the connecting portion in which the solvent is filled,
wherein the connecting portion is increased in an inner pressure by transporting the solvent or the polyisocyanate residues to the connecting portion by the residual transporting unit in the state of the opening and closing unit being closed, and
wherein the high temperature and high pressure water is fed from the water feed pipe to the decomposing tank, and after a decomposing temperature and a decomposing pressure of the decomposing tank reach a predetermined decomposing temperature and a predetermined decomposing pressure, the opening and closing unit is opened to feed the solvent from the residual feed pipe to a confluence portion thereof with the water feed pipe, first, and then, the polyisocyanate residues are fed thereto. - The start-up method for the decomposing system for polyisocyanate residues according to Claim 2, wherein the opening and closing unit is a flash opening and closing unit.
- A decomposing system for polyisocyanate residues comprising:a decomposing tank for allowing polyisocyanate residues and high temperature and high pressure water to contact with each other,a water feed pipe, connected to the decomposing tank, for feeding the high temperature and high pressure water to the decomposing tank,a residual feed pipe, connected to the water feed pipe, for feeding the polyisocyanate residues to the decomposing tank together with the high temperature and high pressure water, andsolvent filling unit, interposed in the residual feed pipe at a portion thereof connecting with the water feed pipe, for filling the solvent in the portion.
- The decomposing system for polyisocyanate residues according to Claim 4, which comprises opening and closing unit interposed in the residual feed pipe at an end thereof connecting with the water feed pipe, and residual transporting unit interposed in the residual feed pipe at a location thereof on an upstream side of the opening and closing unit,
wherein part of the residual feed pipe extending at least between the opening and closing unit and the residual transporting unit serves as the connecting portion in which the solvent is filled. - The decomposing system for polyisocyanate residues according to Claim 5, wherein the opening and closing unit is flash opening and closing unit.
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PL06781221T PL1902088T3 (en) | 2005-07-12 | 2006-07-12 | Decomposing system for polyisocyanate residues, and start-up method for the same |
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JP2005203222A JP4705425B2 (en) | 2005-07-12 | 2005-07-12 | Decomposition apparatus for polyisocyanate residue and start-up method thereof |
PCT/JP2006/314214 WO2007007908A2 (en) | 2005-07-12 | 2006-07-12 | Decomposing system for polyisocyanate residues, and start-up method for the same |
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US (2) | US7875253B2 (en) |
EP (1) | EP1902088B1 (en) |
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CN (1) | CN101223222B (en) |
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WO2009130842A1 (en) * | 2008-04-26 | 2009-10-29 | 日本ポリウレタン工業株式会社 | Method for breaking down urea compounds |
KR101429834B1 (en) * | 2009-12-24 | 2014-08-12 | 미쓰이 가가쿠 가부시키가이샤 | Method for treatment of isocyanate residue, and method for treatment of carbonate |
CN114605288B (en) * | 2020-12-03 | 2024-02-02 | 万华化学集团股份有限公司 | Efficient separation and recovery process and device for isocyanate polymer |
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-
2005
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Also Published As
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CN101223222B (en) | 2011-05-18 |
PL1902088T3 (en) | 2009-05-29 |
TWI395772B (en) | 2013-05-11 |
EP1902088A2 (en) | 2008-03-26 |
US20110027134A1 (en) | 2011-02-03 |
TW200704679A (en) | 2007-02-01 |
DE602006003902D1 (en) | 2009-01-08 |
JP2007022926A (en) | 2007-02-01 |
ES2317576T3 (en) | 2009-04-16 |
KR20080026632A (en) | 2008-03-25 |
US8282889B2 (en) | 2012-10-09 |
JP4705425B2 (en) | 2011-06-22 |
WO2007007908A2 (en) | 2007-01-18 |
KR101228450B1 (en) | 2013-02-01 |
US7875253B2 (en) | 2011-01-25 |
CN101223222A (en) | 2008-07-16 |
WO2007007908A3 (en) | 2007-06-28 |
US20090137847A1 (en) | 2009-05-28 |
ATE415445T1 (en) | 2008-12-15 |
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